Patents Assigned to I
  • Polyfluoroallyloxy compounds, their preparation and copolymers therefrom
    Patent number: 4275225
    Abstract: The reaction of a polyfluorocarbonyl compound such as a polyfluoroketone or polyfluorocarboxylic acid fluoride with fluoride ion and a polyfluoroallyl chloride, bromide or fluorosulfate produces a polyfluoroallyloxy carboxylic acid or ester, e.g., CF.sub.2 .dbd.CFCF.sub.2 OCF.sub.2 CF.sub.2 COOH. The polyfluoroallyloxy compounds copolymerize with ethylenically unsaturated monomers such as tetrafluoroethylene, chlorotrifluoroethylene or vinylidene fluoride to form polymers which are moldable, and in some cases electrically conducting or are water-wettable and dyeable.
    Type: Grant
    Filed: May 1, 1980
    Date of Patent: June 23, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Carl G. Krespan
  • Scraped wall agitator
    Patent number: 4274751
    Abstract: An agitator wiper for a tubular chemical vessel in which agitation of the vessel contents is achieved by a blade positioned helically around a central rotating shaft and wiping of the vessel walls is achieved by segmented plates positioned along the blade and constructed to provide wiper tips which wipe all portions of the vessel walls.
    Type: Grant
    Filed: March 26, 1980
    Date of Patent: June 23, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: James L. Rector, Paul R. Weber
  • Curable blends of chloroprene polymer and ethylene copolymer
    Patent number: 4275181
    Abstract: Curable blends of chloroprene polymers are obtained by modification with ethylene/carbon monoxide or sulfur dioxide copolymers containing an additional softening copolymerizable comonomer such as vinyl esters, alkyl acrylates and methacrylates, alkyl vinyl ether, acrylonitrile, methacrylonitrile etc. Modification with the ethylene copolymers results in improved processing, increased resistance to ozone and reduced cost.
    Type: Grant
    Filed: November 30, 1979
    Date of Patent: June 23, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: George L. Hoh
  • Process for preparation of high opacity photosensitive images
    Patent number: 4275140
    Abstract: Process for preparation of high opacity colored images on a photosensitive element surface which comprises bringing into surface-to-surface contact two elements, e.g., by laminating at elevated temperature, element (1) being a photosensitive element having tacky and nontacky image areas, and element (2) being an adhesively supported pigment/binder layer, 75 to 95 parts by weight pigment, e.g., TiO.sub.2, and 25 to 5 parts by weight elastomeric binder having a relatively low maximum tensile stress and a high elongation to break when cast as a film, and separating the two elements.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: June 23, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Melvin A. Neiss
  • A modular heaping-type packing element
    Patent number: 4275019
    Abstract: A modular packing element of generally pismatic or rectangular shape having a continuous side wall formed of rolled sheet material having both surfaces formed with an array of elongated, thin protrusions in the form of needles, cones, spikes, or the like, of various lengths, extending both inwardly and outwardly.
    Type: Grant
    Filed: June 21, 1979
    Date of Patent: June 23, 1981
    Assignee: Przedsiebiorstwo Wdrazania i Upowszechniania Postepu Technicznego i Organizacyjnego "Posteor"
    Inventor: Stanislaw Bednarski
  • Press fit terminal with spring arm contact for edgecard connector
    Patent number: 4274699
    Abstract: An elongated electrical terminal with a deformed mounting portion adapted to be press fit into a circuit board aperture in an edgecard connector. The mounting portion is a generally cylindrical body with symmetrically opposed oval shaped voids extending lengthwise therein. The terminal has contacts at both ends; one of the contacts is a spring arm, the other is a wire wrap tail. The spring arm has a free end parallel to, but off-set from the axis of the wire wrap tail. A plurality of such terminals are press fit into apertures in a supporting circuit board. An insulative connector housing adapted to receive a mating circuit board fits over the spring arm contacts and mates with the supporting circuit board to form an edgecard connector.
    Type: Grant
    Filed: October 9, 1979
    Date of Patent: June 23, 1981
    Assignee: E. I. Du Pont De Nemours and Company
    Inventor: Kenneth J. Keim
  • Ethylene-acrylic enamels
    Patent number: 4273695
    Abstract: Curable coating composition containing the film-forming ingredient consisting essentially of, with the sums of the parts by weight and the mole percentages being 100 and 100%, respectively:(1) about 55-95 parts by weight of a copolymer of(a) 20-70 mole % ethylene,(b) 20-60 mole % methyl methacrylate,(c) 1-15 mole % of a hydroxyalkyl ester of acrylic acid or methacrylic acid in which the hydroxyalkyl group contains 2-4 carbon atoms, and(d) 0-9 mole % of an .alpha.,.beta.-unsaturated carboxylic acid selected from acrylic acid, methacrylic acid, itaconic acid, crotonic acid, 2-ethylacrylic acid, and 2-propylacrylic acid, or of maleic anhydride, and(2) about 5-45 parts by weight of a nitrogen-resin crosslinking agent.
    Type: Grant
    Filed: December 20, 1979
    Date of Patent: June 16, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Robin N. Greene, Walter R. Hertler
  • Flake silver powders with chemisorbed monolayer of dispersant
    Patent number: 4273583
    Abstract: Flake silver powders which have a chemisorbed monolayer of organic dispersing agent such as oleic acid on the surfaces and process for their preparation are provided. Such silver powders can be formulated into thick film pastes at above 85% solids levels at relatively low viscosities. Pastes so obtained, when printed and fired, result in films of excellent conductive efficiency.
    Type: Grant
    Filed: June 29, 1979
    Date of Patent: June 16, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Leo W. Tyran
  • Acicular .alpha.-iron particles and recording media employing same
    Patent number: 4273807
    Abstract: Particulate product containing at least 75 weight % iron (total iron content) and at least 25 weight % acicular .alpha.-iron metal, process for making said product and magnetic recording medium having said product incorporated therein, said product having a length less than 1 micron (.mu.), a length to diameter ratio of at least about 10:1, a coercivity (iH.sub.c), of greater than about 800 oersteds, a saturation magnetization (.sigma..sub.s) of at least 110 electromagnetic units/gram (emu/g), a residual (remanent) magnetization (.sigma..sub.r) of at least 50 emu/g, and a ratio (.sigma..sub.r /.sigma..sub.s) of residual (remanent) magnetization (.sigma..sub.r) to saturation magnetization of at least about 0.45.
    Type: Grant
    Filed: November 16, 1979
    Date of Patent: June 16, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Kenneth L. Berry
  • Combined portable case and luggage trolley
    Patent number: 4273222
    Abstract: A combined portable case and luggage trolley which, in its preferred form, includes a rigid frame which, when folded, engages a face of the case to become an integral part thereof and which is extendable therefrom to form a luggage support in cooperation with a spaced pair of frame support arms pivotally connected to the case. When extended, the rigid frame is alignable with the support arms in a common plane to define a luggage receiving framework in cooperation with the case. Wheels are mounted within recesses in the case for selective extension in association with extension of the framework.
    Type: Grant
    Filed: August 22, 1979
    Date of Patent: June 16, 1981
    Assignee: K. A. I. Cassimally
    Inventors: K. A. I. Cassimally, Horace Frommelt
  • Boom lock means
    Patent number: 4273502
    Abstract: A releasable locking mechanism for holding a boom in a stored position on a support consists of a latch pivotally supported on the boom and normally held in a first position with a pin carried by the swing tower and aligned with the latch. The pin and latch are positioned such that movement of the boom to the stored position will automatically pivot the latch and produce an interlocking relationship. The release mechanism consists of first and second pivotally interconnected elements, one of which is supported along the pivot axis for the swing tower on the vehicle and the second element having a control member extending therefrom to the operator's station. A universal connection is provided between the control member and the second element, and is located along the vertical pivot axis for the swing tower.
    Type: Grant
    Filed: March 16, 1979
    Date of Patent: June 16, 1981
    Assignee: J. I. Case Company
    Inventors: Herman J. Maurer, Wayne G. Smith
  • Two-stage flotation purification of NaOH
    Patent number: 4273657
    Abstract: A process for purifying an aqueous solution of NaOH by removing suspended NaCl and Na.sub.2 SO.sub.4 impurities therefrom comprising bubbling a gas into the impurity-containing NaOH solution at a first stage temperature above 16.degree. C. up to 31.degree. C. and at a second stage temperature above 31.degree. C. up to about 36.degree. C., separating a foam layer containing NaCl and Na.sub.2 SO.sub.4 from NaOH at the first stage and a foam layer containing Na.sub.2 SO.sub.4 from NaOH at the second stage.
    Type: Grant
    Filed: June 14, 1979
    Date of Patent: June 16, 1981
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Raymond H. Conageski, Joseph D. Paciotti
  • Polyfluoroallyloxy compounds, their preparation and copolymers therefrom
    Patent number: 4273728
    Abstract: The reaction of a polyfluorocarbonyl compound such as a polyfluoroketone or polyfluorocarboxylic acid fluoride with fluoride ion and a polyfluoroallyl chloride, bromide or fluorosulfate produces a polyfluoroallyloxy compound, e.g., CF.sub.2 .dbd.CFCF.sub.2 OCF.sub.2 CF.sub.2 CN. The polyfluoroallyloxy compounds copolymerize with ethylenically unsaturated monomers such as tetrafluoroethylene, chlorotrifluoroethylene or vinylidene fluoride to form polymers which are moldable, and in some cases electrically conducting or are waterwettable and dyeable.
    Type: Grant
    Filed: May 1, 1980
    Date of Patent: June 16, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Carl G. Krespan
  • Polyfluoroallyloxy compounds, their preparation and copolymers therefrom
    Patent number: 4273729
    Abstract: The reaction of a polyfluorocarbonyl compound such as a polyfluoroketone or polyfluorcarboxylic acid fluoride with fluoride ion and a polyfluoroallyl chloride, bromide or fluorosulfate produces a polyfluoroallyloxy carboxylic acid fluoride or sulfonyl fluoride, e.g., CF.sub.2 .dbd.CFCF.sub.2 OCF.sub.2 CF.sub.2 SO.sub.2 F. The polyfluoroallyloxy compounds copolymerize with ethylenically unsaturated monomers such as tetrafluoroethylene, chlorotrifluoroethylene or vinylidene fluoride to form polymers which are moldable, and in some cases electrically conducting or are water-wettable and dyeable.
    Type: Grant
    Filed: May 1, 1980
    Date of Patent: June 16, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Carl G. Krespan
  • Coating compositions of an alkyd-acrylic graft copolymer
    Patent number: 4273690
    Abstract: A coating composition containing as the film forming binder a graft copolymer having an acrylic backbone and alkyd resin chains; whereinthe acrylic backbone of the graft copolymer is of polymerized acrylic monomers and contains about 0.1-20% by weight of polymerized isocyanato alkyl acrylates or methacrylates and the alkyd resin side chains are attached to the acrylic backbone by an isocyanato group that reacts with a hydroxyl or carboxyl group of the alkyd resin.An alkyd resin and plasticizer are usually added to the coating composition. The coating composition can be diluted with water or solvents for application and is particularly useful as a finish for automobiles and trucks and other equipment and can be used to refinish and repair automobile and truck finishes.
    Type: Grant
    Filed: October 9, 1979
    Date of Patent: June 16, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Aloysius N. Walus
  • Polymeric binders for aqueous processable photopolymer compositions
    Patent number: 4273857
    Abstract: Photopolymerizable compositions are described containing a polymerizable ethylenically unsaturated monomer, a photoinitiator or initiator system, and selected acidic polymeric binders. The organic binder mixture contains a compound chosen from each of two selected classes. These photopolymerizable compositions yield superior processability, i.e., on developing and stripping, in solely aqueous alkaline media devoid of organic solvents, decreased softness and/or tackiness, and improved adhesion when compared to the prior art. The compositions are particularly useful for preparing photoresists.
    Type: Grant
    Filed: August 14, 1979
    Date of Patent: June 16, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Ernst Leberzammer, Leo Roos
  • Cable saw for tree harvesting apparatus
    Patent number: 4273169
    Abstract: A tree harvesting cable saw includes an elongated flexible cable that has a plurality of tubular cutting links located at spaced intervals thereon with reversible drive means for driving the cable saw in either direction of its length. Each cutting link has an axial opening for receiving the cable and a continuous cutting edge on each end extending circumferentially around the entire cable and being spaced therefrom so that the cable can be driven in either direction and sever a tree. The cable saw is supported on a frame through a drive pulley and a driven pulley and is driven by a reversible motor. Preferably, the frame is movable between positions so that the cable saw can be forced through a standing tree to sever the tree adjacent its base.
    Type: Grant
    Filed: April 12, 1979
    Date of Patent: June 16, 1981
    Assignee: J. I. Case Company
    Inventor: Paul W. Baenen
  • Apparatus with expandable tube bundle
    Patent number: 4271900
    Abstract: An apparatus comprising in combination (a) an elongated bundle of flexible, relatively small diameter, thin walled hollow polymeric tubular elements of various lengths, in a twist configuration having a length greater than the housing and a lateral dimension securing means at both ends, (b) a housing means for said bundle wherein said bundle extending entirely within said housing means with said bundle anchored to said housing means in said twisted configuration, (c) means for securing in fluid tight arrangement said housing means to said lateral dimension securing means and (d) circular spacers for the tubes, the longer length of said bundle when secured within said housing means causing a bowing of said tubes that permits flexing and moving of the tubular elements in said bundle.
    Type: Grant
    Filed: June 28, 1978
    Date of Patent: June 9, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Charles F. Reitz
  • Method of monitoring oxygen concentrations in gas streams
    Patent number: 4272249
    Abstract: The concentration of oxygen in a gas stream is determined by passing the gas stream through an optical absorption cell maintained above about 100.degree. C., sealing off the cell, injecting sufficient amount of nitrogen oxide, NO, to react with all of the oxygen in the gas stream, and determining the absorbance of nitrogen dioxide, NO.sub.2, formed in that reaction. This method is quick, accurate, and independent of gas flows or gas pressure.
    Type: Grant
    Filed: January 28, 1980
    Date of Patent: June 9, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Joseph P. D'Antonio
  • Method for protecting a bioreactor pressurized head tank against extreme surges of influent waste water
    Patent number: 4272379
    Abstract: A method and apparatus is provided whereby a pressurized long vertical shaft bioreactor is protected against extreme surges of influent waste liquid. The method provides for the transfer of excess waste from the top of the bioreactor head tank to an adjacent collection vessel where, in response to the pressure created in the bioreactor, the collected waste is caused to overflow and is returned to the influent waste stream. The method permits the return of waste from the reactor to the influent stream while bypassing the normal circulation route through the reactor. Simplification of control is provided and float or level control valves may be eliminated thereby reducing construction, operating and maintenance costs.
    Type: Grant
    Filed: June 13, 1980
    Date of Patent: June 9, 1981
    Assignee: C-I-L Inc.
    Inventor: David C. I. Pollock